<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Document</title>
	<style>
		.box {
			width: 100px;
			height: 100px;
			background: #ccc;
		}

		.wrap {
			background: yellow;
			overflow: hidden;
		}

		.wrap h1 {
			background: pink;
			margin: 40px;
		}
	</style>
</head>

<body>
	<div class="box">box</div>
	<div class="wrap">
		<h1>h1</h1>
	</div>
</body>

</html>